Biology Unit 3.4: Cell Processes; Scientists Cheat Sheet by bittersweetkarma

He weighed a pot of soil before and after he planted a willow tree in it

The pot weighed the same afterwards but the tree was sevent­y-five kilograms so he concluded the plants mass came from the water and not the soil

He put a lit candle in a jar with a piece of a mint plant

There was then no oxygen in the jar

He took a magnifying glass and was able to light the candle through the jar, meaning somehow that there was now oxygen in the jar

He measured the amount of water he gave to his plant

However, the plant only grew one gram

He started out similarly to Priestly's experi­ment; with a lit candle and a plant in a jar

When he tried to light it later, the candle would not light

He also did another experiment where he had an aquatic plant

When there was no light, the plant did not produce bubbles